Ring-tensioning machine



De'c. 1l, 1928.

INVENTOR W R. B. wAssoN RING TENSIONING MACHINE Filed Jan. 8, 1923 INVENTOR 1 R. B. WAS'SON RING TENSIONING MACHINE Dec. ll, 1928.

Filed Jan. 8, 1923 14 She'ets-Shet 3 Nmx INVENTOR M f6- WW ATT RNvEY Dec. vll, 1928.

\ R. B. wAssoN f RING TENSIONING MACHINE Fild Jan. 8, 192s 14 Sheets-Sheet'. 4

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-R. B. WASSON RING TENSIONING MACHINE Filed Jan. a, 192:5 14 sheets-Sheet' VR. m. w w.

R. B. WASSON RING TENSIONING MACHINE IN VEN TOR A TT RNE Y 17910' /zga Dec. ll, 1928.

Dec. ll, 1928.

R. B. WASSON RING TENsIoNING MACHINE Filed Jan. 8, 1923 14 Sheets-3116611.18

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R. B. WASSON RING TENSIONING MACHINE Filed Jan. 8, 1923 14 Sheets-Sheet 9 INVENTOR X @l 4 g'mvsy 7 Dec. 11, 192s. 1,695,031

R. B. wAssoN RING TENSIONING MACHINE Fileduan. s, 1923 14 Sheets-Sheet;A 1,121-` f 135 l l K ,f M. /ll l /l 134 M4 /5 INVENTOR dnl-vk By Iig. v l Q Ar RNEV Dec. ll, 1928. 1,695,037 R. B. wAssoN 4 RING TENS IONING MACHINE Filed Jan. a, 192s 14 She'os-Shet' 1s n `\v f 9947 f5@ 159 ,ff/ 6l fa .f

IN VEN TOR l -ffH/sm 117 WQ?, Qua-f Dec. 11, 1928. 1,695,037

R. B. wAssoN RING TENSIONING MACHINE Filed Jan. 8, 192s `14 Sheets- Shet' 14 N N K INVENTOR ATTOR y Patented Dee.11,1928; v i i i j UNVIDV STATE is. P TEN T OFFICE y .ROBERT'BINGHAM Wasson/0F cnanronn? NEW JEnsnY.-

i Yam:f-'rmtsIoNINeMAGHINE. i

.A Appnation ruea'January ag 19273. serial No. 611,273. Y y

My invention vrelates todav machine tor con# zero I The y'zero point l'is at the middle densingv metallic` packing or pistonY rings, of the split portion.

saidk machine ,including afcondensing rollerv VOther objects of the-invention are to pro- 55,

Vfor creating permanent-j stress in the. ring vide a condensing roller oftapered or frusto- 5 blank, u f j y. conical shape which Wil-l condense one'ofthe One of the objects of myinvention is to curved faces of the ring so as to causethe ring provide a' .machine which varies the magnito twist gto locate and vary the position of the tude of thesestresses inn accordance withA a condensing rollr 'with reference tothe line 6o predetermined law so that when piston or 0f pressure7 depending on the size 0i' the ring packing rings, i. e., expanding or-contracting to-,bel condensed; to lapply the pressure by a Y rings, are condensed in the machine7 they will Crank nv'lecha'ni'sin orequivalent inechanisnii exert substantialunifor'm radial pressure perf `SO, that thepressure Will be applied'by the lunit of area of contact'lvvhen coniined in the 'Correct predetermined lamv, to provide for 65 Y :engine cylinder or bearing in `which they are Changing the ulcrum of .one 'of-5119 lillkS i utilized. The law which gives the pressurek through `whichk the pressure is appliedthere-` vapplied to the pressure applyingrollerlis the by enabling the ETGSSUTG'tbe vVlfed 'W13-311' i law of the crank With'ajlong connecting rod, WOlklng 0n' rings bf'diiierent radial thiclr `so as to vary the magnitude ot the stresses ness; to providetor twoor more Springs of .7,0' gvenle ring, diilerent strength `for transmitting Vthe presv` VThe principles governing a ring which Surefalight Spring 01' applying "JhG'PIS- tends to contract with substantially uniform S'llle the'pointsnt the SPH-t PGftfms 0f .pressure .from its expanded condition or vto llght llHQS and 2L l-leflvyplllg OIPIGSSUTQ expand with substantially uniform pressure @370ml th@ PGS Of light Ol'hWy l'lgS( i5" A from itsv contracted condition through its With IGWOOVGRH Other ObjeCtSin View,"

own inherent stressesv arethe same. The inmy invention consists in the partsj improve# vention can be appliedto one as readily vas ment-S H ll COmbnOIlS MOF@ 'UY Pointed tothe other byreversing the positions oiwthe` Out llellnaftelt I l A condensing tool and ring supporting member Refllfllg 110W t0 the ClvlWHlgS; so with relation to the ring. For the sake of Fig. l 1s a plan `View lOOking downen the clearness these drawingsy and speciiications C013 Q the mlhl@ describe the mechanism covering the expand- F 1g. 2 is a plan view on a larger scale showi-` ing type ot'ringonlv but it is to bey underlng the right hand end of the machine, ,illusstood that the invention is not limited to the tl'llngdetails VOf th@ driving' meChMlSln 0f 35 l manufacture 0f rings of this wps the `.ring holder and of the inea-ns for rotat- Anotherv object of the invention is to.pro,V lng 1t. Y j vide such a machine which controls and-va.-` Fig 3, S an @Hd leVaOIl 10 V3klflg` tOWllCl ries Athe stresses in a piston ringin suchV a the @Dd Of the miwhiie t the Tight of'Figfl. u manner that they are unbalanced according 'n Fig. 4: is a section,full size, passing through 90 .to predetermined law kand so that they cause the ring holder on'the line i-2i ofwFigL;A 1; 40 the ring to twist about a -circumterential Fig! 5, is a section, full size taken through v Yaxis and translate this twist into a substan the ring holder at right anglesV tothe section 1 r tially Vuniform pressure per unit ot'v area of taken Online ,1i-4; Fig. 5 being taken on the Contact localized toward one edge of the ring linef-5-5otFig-l(f, y l f 95`- when thel ring is conined in the engine cyl-V l Figs. 6 and l7v are sectional details illus'- 15v inder, The twist is in accoida,nc e\vith a pretrating .the operation of condensing 4ther-incr,- determined law, the twist, when the ringis theI parts bein@ illustrated'in tvvo positions.

in a free state,v being least at the split and yThese sections are taken on theline 6 6 oi most atthe point opposite the split and varies *Figi 2 i 100 between these twopoints in accordance with Fig. 8 is a sectional planvieiv showing the l Nl' thelawfthetwist increasing iirst giadualljyv support for the roller which condenseslthe then more rapidly, .then lessfrapidly and ring, as Well as thering While being coni reaching its niaXinium'lSOO away from the densed. VThis section is'taken'on line 8-8 ot' of Fig, 8.

Y driying shaft 12, 'which ha Fig. 11 is a plan View illustrating the meehanism for movii'igthe ii'essure applying roller omitting some of t e associated parte.

Fig. 12, is a sectional detail on line 12-12 of Fig. 1, showing part of the stop 1neclia-'` nism. y y

Figl, is a longitudinal sectional View on line 13--13 of Fig. 1, passing through the pressure applying roller and the springs associated therewith, and also illustrating part of the tulcium shifting mechanism.

Fig. 14, is a transverse section on line 14.-14 of Fig. 1.

Fig. 15, is a transverse sectional View on line 15-15 of Fig. 1 illustrating the adjustable crank and one of the camsof the fulcrum shifting mechanism;

Fig. 16, is a longitudinal sectional View takenon line 16--16 of Fig. 1i, illustrating the adjustable crank and one of the cams of the ul'crum shifting mechanism. l Figs. 17 and 18 are two sectional Views on line 1'7--17 of Fig; 1, illustrating the unloading mechanism for moving the chuck, permitting the removal of the 11mg,Y the parts being shown in two positions in the two igures.

19, is a View7 of thcmechanism for controlling the shift of the fulcrurn' of the pressure applying roller mechanism and also illustra tes the unclutching mechanism of the machine. Referring again to the drawings, the relierence numeral 1 denotes the bed oif the niachine which is pivoted at tiiinnions 2, 3 and 4 to upward extei'ision 5 ot' the hase G. The bedplate l, may have one or more downwardly pivoting arms T, which are provided Vwith bolts S to engage arcuate slots 9 in the parts 5 of the base G (Fig. The pivots being coaxial with the main driving shaft, this enables the bed of the macliineto be swung at any angle and secured there. so `the operator may Workon the machine in a horizontal plane as shown in the draivings-or it may be tilted to any desired angle, so as to permit ready inspection an d adjustment of the Working parts mounted on the bedplate.

Means are provided for driving the machine, as follows: l V

Mounted in bearings 1() and 11 is the main s secured to it, the Worin 18, that engages the worin Wheels 14 and 15. A gear 16 is secured to said shaft 1Q and is inmesh with a `pinion 1T on a count'er shaft 18, which may be driven in any suitable inanner The Worin wheel 111 rotates the piston ring carrying mechanism and the Vbeing subjected tothe condensing forces Vwhich give the ring radial pressure and twist will now be described. f

A rotary member such as a Worin Wheel 14 has secured to it the carrier 23 by bolts 24, located near the outer periphery of the Worm wl'ieel 14. The carrier 23 is rabbeted or shouldered at 25 for engagement with the ring holder 26. The holder is locked to the carrier hy a pin 2z?. This holder as shown m the drawings is removable and the opening Q7 may be of any desired size to accommodate various of rings and may be asuitable shoe for large rings@ The piston ring .c to be condensed and twisted is of a slightly less diameter than the diameter of the opening 27 oi the holder. The outer edge or periphery of the memberf23 is engaged by the pressure applying roller 28, which tends to yieldingly force the Worin Wheel 14 and the carrier 23 and holder 26,` carrying the ring a, against the condensing roller 29.`

The mechanism for holdinnr the condensing 1 lb i'oiler 29 and ttor providing the yielding pressure for the pressure applying roller 28, While the ring is being condensed so as to gire it radial pressure and a twist Will be hereafter described.

ln the machine illustrated the piston ring may be condensed after or before it has been split. The piston ring beingof a slightly less diameter than the diameter ol' the opening o't the ring holder as illustrated more particularly in Fig. 8, a `very/,7 advantageous result is oljitained.

Ai: the holder and ring are rotated and the small condensing roller 29 and the top and bottoni rollers are held in place, that isto say, being. allowed no bodily movement but merely i'crolii'e, the ring and its containing holder in el'ect are drawn through and pass between the. bite oi" the bot-tom and top rollers and the condena-:ing roller. The 'yielding pressure is nuiintained by the pressure applying mechanism, the eiiect being that the circiuuterential increase in the ring is not retarded and the radial pressure remains undisturbed While the width of the ring is not permitted to increase, the adal thickness diminishing slightly under pressure. Means are thus provided for gripping the ring blank while being condensed and also permitting the entire blank to increase its circumferential dimension so that the flow of inetalcircuiaierentially in the ring is not retarded.

lilo

iwi

The' worm VWheel 14 is made in thetormot a ring'and a circular plat`e30,`with thel'shoulder 3l tits inthe opening'. `A This pla-"te 30 .l is secured to the bedplate l by bolts 32, which pass through openings''in vsaid bedplate parts aresuitably supported for rotating and f yet mayjinove in the direction on which the torce in applied; j l .v The plate 30 has a cut out part `35 in'w'hi-chis located the'block 36 which supports the condensing roller'29. j` This vblock BSgengages '2u the sidesyot thecutoutportion of, the plate 30 and allows theplate and'its associated partsto move only inthe direction'in which thef'pressure is applied and prevents move- Vmentor the platetransverseto the line ot Apressure.` The bed -`plate 1 is-also provided V,with a shoulderedslot 37 in which the block .86 is'jheld stationary and is adjusted by the adjustingv bolt 538 [which is threaded at its outer'end in the bedplate 1 andhas the groove 39 on itsinner end, said'groove being engaged Vby the pin 40secured .inV the-bloelr- 36; The only -tin'ielit is necessary tov change the positionot the block is When-the' diameter ot' the ring Jto. be jcondensedfis phanged. itongue 4l sliding inslot-42 and attached by at a point opposite thetcondensing roller.'y

Secured to the bloclr 36 ris the stud 43 upon' which is mounted the roller'bearing 44, which supports the condensing VrolleraQQ/ "-lhis- `roller oli' a comparatively 'small "diiaineteiz- 4The greatest "practical dinerence in magnitude of the arca ofcontact between relier andr ring and'liolderl and ringzis 'd'esirabl'en it is known troni experience in peening or hammering rings, tl at onceestablished, aiiyvariation in therelation ofv these areas, ene-totheother, such as the wear ot the strik-- Y a variable" ingpointctc., Vresults in Y Y Y product which will not meetL the require- 1iients.`My condensing roller andthe ring holder overcome 4these diiiiculties. The roller 1s preferably ot less diameteraiid ot less length than the axial width ci the ring.

The roller 'in the bestenibodinient ot' the invention is slightly'ta'peredor trust-o `conical, as shown in the' drawings (see Figs. 5, 6, and

jduced'in th-efinetalfout of balance, in accordance 'with a predetermined law which produces a very desirable -e'iect "in the finished* 1 block.y The pla scribed. Y l j. j Y

Means are provided for confining the kconeral'iiow ol metalfacross the width ot the ring, 'namely ay twist in'the ring which increases the pressure at the :contacting 'e' dgeV ot the ring when it is in the cylinder.` Theroll'er v-is positioned slightlyy ott-the*centerline as y shown in Fig. 8, and isfreelly movable or floating. I tislocated-ofl' the-line of pressure and atl the nearv sideof the li'nefwhich a point-otl the ring approaches bei'oieit is condensed. l'llliifs enables a heavypressuret tobe applied tothe Y vroller and ring.' Means are provided tor sup-:`

porting "the" roller against.. pressure.A In fthe form-shownzth-eroller is supported on the' annular ring 45, which in turn is carried bythe rollersf46 otv the bearing 4.4; Y f y, Y i Y. Y

Means are providedy for securing av very I tine adjustment ot the position of the roller k29. VA housing-47 -is provided, said housing having a pair of lugs 48 each having lanadjusting screw 49 which contacts withopposite sides'ol' a stud 50 carried by the block A The rollerfis locatedin a vcutoutV notchloj the housing and a glass hardened pin '52 isle-1 catedon the sideoi3 thenetch (see Figs. 8 andr- 10)*'to'ward u'hich the roller is forced, when Y the ring isbeingtensioned. The roller'nioves slightly in the notch 5l toward the pin.qSome play is provided in notch 5l torthefpurpose (see lFig. l0.)

Y lts bodily movement then f stops'. It rotatesas the ring holder and ring f continuesI to turn. The pin`52 may beturned to present another surface/and is readily renewed it'V at'any. time it becomes somewhat' i worn. The roller 29 has aXial'eXtensions'QQ `bottom portions ot housing 4'? at the notch.: j f

*which-keep thefroller substantially upright by Contact withthe top and me l screw 42s" to theblock 36 sup'port'stlie; ring f' 'A' plate secured to thebed '1 by the bolts4 i 54 supports the bloclr-SKG and, the shoulders'ST lprei/ent any upward displacement of said l 53 isj suitably groov-ed and:

slotted 'at 53a to allow" the parts securedtovtheY `block tofbe movedl when adjustment isbeing made.Y Means are Ypro vided .for relieving thepressure on theroller 29 so that Athe rings may be readily placed into or removed from the v. chuck, which means-will befhereafter dedensations inv metal to a radialand circumferential direction and solas to prevent a latring. Under ythe lawotl pressure appliedfto the ring bythe condensing` roller the condensing effect at the points ofthe ringer at Zero l degree, is very smalhbut increases variably to Vannular section ofthe ring. In'accordance f with the inventionthis flow is limitedto a circumferential lflow and` any substantial change in the width ofthe aceot the blank-is prevented whichwould require correcting operations'and introduce further variables. i

vv`Aroller`z55 is held toV thefblock 'by platesa.

This roller supports `the under face of the ring a to be condensed and thus also helps to eliminate friction. As-stated above, means are provided for condensing the inside of the 6 ring in such a way as to give it a twist.` v

A rollerlsee Figs. 4, I5, and 7) is positioned so as to be brought in Contact with the upper face of the ring when it isbeing condensed. It is `thus seen that the inner face of l the ring is supported by the roller 5E, the outer face by the holder 26 and the upper 'lace confined by the roller 56. Preferably, the top and bottom rollers overlap the flat faces of the ring and the condensing roller is shorter than `l the axial width of the ring. Thus when the ring is revolved, when it is condensed by the condensing roller 29, the metal is confined and the condensations are confined to a radial and circumferential direction. Moreover, the upeo per and lower rollers being driven by frictional contact with the ringholder 2Ghelp to turn the ring a (see Fig. 7 )u Thelines of pressure between the top and `bottom roller and the rings should be substantially in the same plane with the line of ressure between the condensing roller and t e ring so as to prevent unequal condensations of the metal of the top and bottom faces of the ring. Means for adjusting the top and bottom roll- 30 ers are provided.

When the roller 29 is adjusted as above described the top (56) and the bottom (55) rollers are also adjusted, the bottom roller being adjusted Vby means of, shims (not shown) p The roller 56 is` pivoted on a stud 57 which is mounted in a block 58 having a slotted connection 59 with the arm 60, theslotted connection permitting accurate positioning of said roller 56. The arm 60 is short shaft 61, which is located above the main driving shaft. By raising or lowering the arm 60, the roller 56 is moved in or out of contact with the piston ring a,

The free end of the arm 60 has suitable means for holding it down in the position shown particularly in Figs. l, 2, 3 and 4. plate 62 has a pair of lugs 63 integral With it, between which the free end of arm 6() drops when said arm is swung down.` An adjustable stop bolt 64 threaded into the plate G2 between the lugs acts as a stop to prevent the arm 60 from being forced down too hard and creating too much pressure on the piston ring` to be rolled. The lower part of said plate 62 has a shoulder 65 to cooperate with a slot 66 in the bed plate l. The plate also has a clearance hole 67 for the bolt 68 which is threaded for a substantial part of its length. v When the 'plate 62 is properly located it is held rigidly in position. The bolt 68 is threaded into the nut 69 at its lower end and a nut 7 0 is provided at the intermediate part of said bolt` above the plate. The nut 70 is pivoted on av shown provided with a handle 71 so as to facilitate loosening said nut when it is desired to move the plate, after which movement the nut may be turned so as to lock the bolt and plates in position.

On the upper part of said bolt 68.is mounted a cam 7 2 provided with a handle for holding the arm 60 in position. As shown in Fig. 2, one side of this cam member 7 2 is slabbed oil' as at 73 so that when itis turned counterclockwise from the position shown in Fi p. 2, it will be clear of the end of the arm IO and said arm may be readily raised.A A pin 7 4 working in the annular groove 75, in the holt 68 (see Fig. 4) allows the cam handle to be rotated without it being moved up or down, y 4

When it is desired to change the size of the ring that the machine is condensing, the arm 60 is repositioned on the shaft 61, the nut 7() is loosened and the bolt G8 carrying the mechanism for'holding down theV arm 60 is correspondingly relocated, thus relocating and securing the roller` in place.

The pressure applying means for forcing the pressure applying; roller 28 a 'einst the holder 26 will now be described. he roller 28 is pivoted on a stud 76 mounted in the slide block 77 which slides in the bed plate 1. Plates 79 coniiiie the block in position in the guides. Means are provided for transmitting a yielding, spring pressure to the block and for adjusting the springs. rIhe block has mounted in the side opposite theroller 28 a stud 80 which has threaded on it two nuts Bland 82. A flange 83 butts up against the block 77 and has a series of holes in whcha suitablev tool may be used to rotate the stud 80 and thus move the nuts 81 and 82.

A heavy sprin 84 is confined between the larger nut 81 an the wall 85 of a head 86. A lighter spring 87 is confined between the vuides 78 in ,y

smaller nut 82 and the Wall of the head 86.

One or all of the springs are so set as to exert an initial pressure on the roller 28 A which through the mechanism 'heretofore described forces the piston ring a against the condensing roller 29. Under certain conditions it is desirable to vary the initial pressure and this is done by regulating the positions of the nuts 81 and 82v thus giving the springs 84 and 87, more or less power. The amount of free coils of the sprlngs and the length of the springs under compression is thus varied. In addition the compression of the springs is varied. In the drawin s two springs are shown.' To take cere of di erent sizes of rings and to compensate for irregularities in the structure of the iron more springs may be provided.` VThese springs may be so arranged that the heavier ones will not come into play until the ring has been revolved a part of a turn. This arrangement 1s particularly valuable because llO they grey ironici `which it is preferable to make the Yring has substantial variations in" its properties 'that may be compensated for.` In the ydrawings 4in Figure 13, both springs are shown in Contact at their 'ends7 they thus act, so to speak, as one spring 'f lhe'maehin-e may be arrangedso thatfthe lightfsp'ring is initially in contaetat its endsivith theslilde bloclrnut and `head, andthe heavy spring is supported by nut 8l but is not initially in contact with the head 86, but comes into contact alter the light spring has been compressed H(see Fig. 1l). Une or. both nuts as Will be seen may be threaded into the springs sov as uponconditions;l Moreover. metals "equire,

to vary the number oit'eii'ective coils of the spring leavingk a'gieater or l ss number' oi Vfree coils. f f

rlhere area number oi methods of adjustl ing the springs7 one being bythe rotation orn ilane collarSB and screw boltv thesecond b j 1 a a lne rotation ol collar 81V and the spring simul-v taneously, thethird by the rotation of collar 'S2 and the small spring simultaneously',y the fourth being by the rotation of collar 81 into the large s rin o 84- and a lilth 'berno' the rotaj tion'oi1 Collar SQ-intothe small spring'thus :altering its iree len'gth. Aln other Words, both springs may be susceptible toadjustment for initial pressure aswell as adjustment fforv free length which covers all pressures between the initial pressure and the vterminal pressure.4

It is desirable When tensioning the ring with one revolutionof the ho'lder'to start with an initial pressure and under a predetenk mined law to increase'the pressure 4until the. pressure has beenv applied haltl Way around vthefring7 at Which'rpoint maximum pressure crank With a longconnecting rod; this pres- Y sure is in turn transierred to the metal loi; the ring, the amount and variation of theresulting compression oi the metal' ci' the*ri-"ngdesl pending on the particular kind oit metal or castironjot' which thering is composed. By adjusting the parts oi the pressure applying mechanism7 the amount of'pressure can be j regulated and the ring condensed so as tog-ive equalradial outward pressure. heY result may be checked by the ring `testing gage. On small-cr sized rings one revolution is all that 4,has been lfound necessary and thepressure applying mechanism will iirst be described Y-ior conoensing the ring in one revolution.`

. On large size rings it is desirable to"Y revolvethering a number kof timesdepending time in which to flow. f It the time element is too short to'permitthe full amount ofllow in the metal thev result will yvary as the metal is harder" or softer. To meet some requirementait is necessary to vsubject the innersuri'ace oi large rings tothe .condensing pres'-Y 'Q-l in' its adjusted position.

sure tWoor more times. Means are yprovided for doing thisand tor building'up agreater pr sui-eier each successive revolution." This will be describedliereaiter.

fa ypredeterininfed law-.when the ring is being `tensioned with one revolution will. now be' described. `The head 86 is mounted toi slide in the ato llhe 'means tor varying the` pressure under .l

resaid. mentioned 4guides' 78, and hasl pivoted on the stud S8 the link89 which is y ftiilcruined on the block 90 in the slot 91- oi' the link SS. livoted tothe opposite end oi the link A89 is the'conn'ecti-ng rod 92.- T'jhe otherl endloi' `the connecting rod 92'has aslot 93 in which is located the block 94. The block 94 Y ylas the bushing '95 therein, which acts as a searing and has secured in it the stud 96. Means are provided for Y adjusting the throw oi' the stud QGWhich stud servesas *ai crank pin. rllie lower end of the' stud`96 is madein the form Voa slide 97 and has threaded therein vanadjustmgbolt 98-'Wliich is secured against longitudinal vi'novementby the pins 99 mounted in the-disc 100 andworkingy leo in the annular groove 1010i the threadedpart v oi thek adjusting bolt Which may revolve .in vthe hole 1020i' th'edisolOO (see Fig. 16). A

'nut 103 on the upper end "of the 'stud j tightened When the block94 is properly posi# tioned by the adjustingscrew k98. This nut holds the blockrigidly tothe bushing ['but tl'iefbushing isiree to rotate in the block. The

disc 100lias guiding grooves 104 for the slide Y on the lower end oit' the stud 96. and said v disc is rigidly heldto the Worm Wheel l5 `by bolts105. i

Means are providedior locking thisblock One edge' of thebloel'r 9d is serratedand engages correspending serrations '106 on `one edge `of an 'angle shaped plate 107. rllhis' angle shaped plate 1.0.7 is bolted at 108, to "theconnecting Yrod 92. lt Will be rnoted thatthe block 94 isadjusted eccentrically or oily center in rela tion to the center of the Worin Wheel 15 'and it isplain from the l"oregoing.. description that as the worm Wheel 15 is revolved by the wormA 13, the connectiiigrod V92v Will Abegiven a: certain gpredetermined' throw which 1 VVwill be" transferred to the link 89V and ivillapply the pressure 'to the ring throught-he mechf anisml heretoiore.described.A By loosen-ing j Yi iok the blockQd and relooking itVY the connecting rod 92vand link-89 maybe adjusted tojreposition the'A link wheny the crank throw7- is Means are provided forv varying the maXimuni pressure applied vWhen condensingrings 'oi' dirl'erent thickness.

cl'ianged so f as topreserve the right-angled ation bet-weenthe lconnecting roda-nd link. j

j j uw linkse 'is mounted on a member109 Whiohis engaged *than the 'ring blank,

\ i-n *the lliolderlso als to by an adjusting and holding screw 11() (see Fig; 1 4). This adjusting screw is mounted in the bed plate 1 so as to be free to be rotated and has the handle 111 at its outer end and is threaded at112 to engage the member 109. Thus by turning the adjusting screw the position of the fulcrum block may be changed and more or less pressure applied to the ringr according to the position of said block 90. Fig. 11 shows a plan vievvo the mechanism employed in condensingr the ring when one revolution is adequate to give the desired results.

When the ring has been given one complete revolution suitable mechanism is provided tlo stop the machine and this will now be described. Secured to the lower part oi the head 86 and passing through a slot 113 in the bed plate 1, is a pin 111 which at the proper time engages a lever 115 pivotcd on the bed plate at 11G. The opposite end of the levetl 115 from that engaged by the pin 114 is bifurratedand a rod 117 passes through the biiureated part. VThis rod is mounted in extensions in the bod plate 1 and carries a collar 1118 which isengagcd at the proper Vtime by the biiurcated part of the lever 115.

The outer end of this rod is in contact with one leg of an angle sliaped member 119 which is pivoted at 120 in a lug on the bed plate. The other leg of the member119 has a shout der 121 that holds the clutch lever 20. A pin `122.1nounted in the bed plate has a spring 123, that forces said pin against the lever Another collar 1`2-lis mounted on the *shaft 117 and a spring 125 between this collar anid one 'of the 'depending lugs from the bed plate keeps the collar 118 in contact with the bifurcated part of the lever 115.

From the foregoing it will loe understood that as lthe4 pin 1141's moved away from the tvok after the revolfii'tion has 'been completer and the ring condensed, it engages the lever 115 and the opposite end of' said 'lever en-V i actes the collar 118 which being h iaston the rod 117 causes the 'rod to move and` the Vouter end of the rod operating on the men ber 119 releases the lever 20. The lever 20 is forced outward 'by the pin 122 and the spring 123 'and 'disengages the clutch 16 which "stops the machine. The machine may be stopped before an entire revolution ot' the ring is completed, the stop motion being so set. Symmetricalportions `oi the ring on eaclil side of Ethe middle 'may thus be rolled 'ltl'iou't rolling the of split.

The ring holder being larger in diameter the ring blank will -ha've *passed vover the "condon sing roller before the ring holder has completed'its cycle et 360. ly adjusting the stop motion mechanism so as tosto Vthe machine when thelast end of tliefring llas been rolled and putting the ring begin condensing near the initial zero position of the ring,

i vided seth at the stop motion may and instead of stopping the machine an" ons dif- `ference is compensated for. Means are probe adj usted completing the cycle of pnessure applied to the ring on a complete revolution of the ring' holder, its cycle can begin at the zero position Jr`or one point of the ring and will end after the ringv has been rolled and the other point of the ring has been reached. This occurs before the holder which is larfrer than the ring has made a complete revo utiou. The ring creeps in the holder due to its increase in circumferential length and the 1mechanism compensates for this creep ing. This ,mechanism is illustrated parti rularly in Figs. lil, 15, lll and 19.

As previously explained in revolving and condensing the ring a number of times, on

each successive revolution an increasing pressure between the points isapplied, the initial pressure applied at thepoints remaining substantially constant. `This is accomplished by shifting the fulcrum `90 in the link 89 and thus givingthc head 86 successive rotation of the ring and compressing the springs 84C and 87, thereby applying more pressure each time.

The Worm Wheel 1.5 is secured or made lintegral Withthe shaft 126 which has a bearing in the bushing 127, mounted in the bed platel. The lower end ofthe shaft is turned down slightly and has secured to it the drum cam 128 by means of the nuts 129. Pivot/ed at 130 in lugs on the bed plate `1 is the slotted lever 131, which has mounted near its lupper. end

'111016 lTIOVGIllCIlt On (lach vll() lou the cam roller 1532 for engagement with the cam groove 133 in the drum cam 128.

Connections are provided for shiftin 4the fulcrurn at each successive revolution olthe ring. The cams and levers are so proportioned and arranged with refer-cintel to the ulcfnum and with reference to the position of the ring in its holder that the sllii'tinzgr oi the fulcrum takes place at each revol in a few degrees from the split portion of the ring, namely afew degrees at each zero degree point of the ring.

The opposite end ofthe connecting rod 135 is pivoted in an ear on a rack bar 136. At its intermediate part the 'connecting rod 135 has" ution, 'yv'i'thside oi the `a turn buckle 137 by which lthe rod "may be lengthened or shortened when bein advjusfted in different positions in 'the slot 1'3 so as to make `it possible to vary ythe amount of moye- Y The sleeve 141h`as 'pinned to it at 15.1.2, one 

